A high-temperature-resistant and anti-outer-wall-material-accumulation air outlet pipeline structure of a spray drying tower

Abstract

The utility model discloses a kind of high-temperature-resistant anti-outer wall material-accumulating spray drying tower inner air outlet pipeline structure, including pipeline body, the pipeline body top is symmetrically provided with slope, the inclination angle of the slope is 35-45 °, vibration device is set outside the pipeline body, for realizing vibration to pipeline body, the inside and outside of the pipeline body is metal layer, and the middle is heat insulation layer. This structure design can solve the problem that the outer wall of the air outlet pipeline in the spray drying tower and itself is easy to accumulate material, the pipeline body is a high-temperature-resistant composite structure, effectively avoids a series of influences brought by thermal deformation, ensures long-term stable operation of structure.

Description

Technical Field

[0001] This utility model relates to an air outlet duct structure, specifically a high-temperature resistant air outlet duct structure for spray drying towers that prevents material accumulation on the outer wall, belonging to the field of mechanical design of spray drying towers. Background Technology

[0002] A spray drying tower mainly consists of a feeding system, a hot air system, the main body of the drying tower, a gas-solid separation device, and an outlet duct. The feeding system uses a screw pump / high-pressure pump to deliver the liquid feed to the atomizer (rotary disc or nozzle) to form fine droplets. The hot air system generates a high-temperature airflow through a burner or electric heating, which is evenly delivered into the tower through the inlet duct to exchange heat and mass with the droplets. The main body of the drying tower is a vertical cylindrical structure with an atomizer at the top and a conical collection hopper at the bottom. The gas-solid separation device typically uses a cyclone separator or a bag filter to collect the dried particles.

[0003] The exhaust duct is a key component connecting the drying tower and the separation unit. Because the outer surface of the exhaust duct inside the spray drying tower is exposed to high-temperature (200-250℃) drying gas for extended periods, some uncollected fine powder settles and adheres to the outer wall of the duct, and may even carbonize and coke. Current technology relies solely on periodic manual cleaning, leading to:

[0004] 1. Low cleaning efficiency: High risk of operating in high-temperature environments;

[0005] 2. Product contamination risk: Carbonized material may detach and mix into normal materials;

[0006] 3. Increased energy consumption: Material buildup on the outer wall exacerbates heat loss;

[0007] 4. Increased material consumption: Long-term accumulation of material on the outer wall leads to yellowing, carbonization, etc., and it needs to be cleaned and scrapped after production.

[0008] In CN208741953U, a spray drying system for preventing material accumulation on the air outlet duct inside a spray drying tower is disclosed. Its main feature is that an auxiliary straight pipe with a conical cross-section is welded to the upper surface of the air outlet duct inside the spray drying tower, and the conical surface of the auxiliary straight pipe is tangent to the circumferential surface of the straight pipe, thereby increasing the port area and thus increasing the material suction range and facilitating material suction.

[0009] However, some shortcomings still exist:

[0010] 1. The drawback of easy material accumulation in the air outlet duct itself has not been resolved;

[0011] 2. The surface of the air outlet duct itself needs to be cleaned manually. Utility Model Content

[0012] To address the aforementioned problems, the present invention aims to provide a high-temperature resistant, anti-material-accumulation structure for the air outlet duct inside a spray drying tower. This structural design can solve the problems of material accumulation on the outer wall and within the air outlet duct of the spray drying tower.

[0013] To achieve the above objectives, the technical solution of this utility model is as follows:

[0014] The system includes a pipe body, the top of which is symmetrically provided with a ramp, the inclination angle of which is 35-45°. A vibration device is provided outside the pipe body to vibrate the pipe body. The pipe body has metal layers inside and out, and a heat insulation layer in the middle.

[0015] Furthermore, the slope combination has an inverted V-shaped structure.

[0016] Furthermore, the slope surface is covered with an anti-adhesion polytetrafluoroethylene coating.

[0017] Furthermore, the vibration device is a silicon carbide air hammer or a high-temperature resistant electric vibrator.

[0018] Furthermore, the silicon carbide air hammer includes a base, which is welded to the outer wall of one side of the pipe body.

[0019] Furthermore, the electric vibrator includes a base, which is fixed to one side of the pipe body by a fixing bracket.

[0020] Furthermore, the composite structure consists of a bimetallic layer and a heat insulation layer, with an inner metal layer, a middle heat insulation layer, and an outer metal layer. The inner layer is a 310S steel layer or an Incoloy 800H alloy, the interlayer is a ceramic fiber heat insulation layer or an aerogel heat insulation layer, and the outer layer is a 304 steel layer.

[0021] Compared with the prior art, the advantages of this utility model are:

[0022] This utility model adopts a high-temperature resistant composite structure, and the pipe body is provided with an inverted V-shaped slope. The slope is covered with an anti-adhesion polytetrafluoroethylene coating. When uncaptured material falls onto the outer wall, due to the low adhesion on the slope, the material will slide into the hopper due to its own gravity and will not accumulate on the outer wall. This eliminates the need for manual cleaning and avoids the problem of material carbonization. In addition, a vibration device is provided on one side of the pipe body. The vibration effect can better prevent material accumulation inside and on the outer wall of the pipe. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] In the diagram: 1-pipe body, 2-connecting flange, 3-inverted V-shaped ramp, 4-silicon carbide air hammer, 5-composite layer material Detailed Implementation

[0026] The present invention will now be described in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0027] like Figure 1 As shown, the technical solution of this utility model is: a high-temperature resistant spray drying tower internal air outlet pipe structure that prevents material accumulation on the outer wall, including a pipe body 1, the top of the pipe body 1 is symmetrically provided with an inverted V-shaped ramp 3, the inclination angle of the ramp is 45°, an air hammer 4 is provided outside the pipe body for vibrating the pipe body 1, and the composite layer material composition of the pipe body is: the inner and outer layers are metal layers, and the middle layer is a heat insulation layer.

[0028] The ramp is the same length as the pipe body 1. The ramp assembly has an inverted V-shaped structure. Specifically, it is composed of two ramps spliced ​​together at the top of the outer wall. The ramp angle is 45° and the included angle between the two ramps after splicing is 90°. A 0.2mm polytetrafluoroethylene coating is applied to the ramp. At this time, the ramp makes the adhesion force less than the gravity component, and the material slides directly from the two ramps into the hopper.

[0029] Furthermore, three silicon carbide air hammers 4 (with a striking force of 40N and a frequency of 15 times / min) are installed axially along the pipe body 1. The air hammers are equidistantly positioned. The bases of the silicon carbide air hammers 4 are welded to the bottom outer wall of the pipe body 1. When the piston reciprocates within the cylinder, it causes the base to vibrate. When the piston moves and strikes the base, the base experiences an impact force, thus generating vibration. This vibration can be transmitted to the pipe body 1, achieving cleaning of the inside and outside of the pipe body 1 and preventing material accumulation.

[0030] An electric vibrator can also replace the silicon carbide air hammer. When using an electric vibrator, it should be considered that during the spray drying process, the material will be atomized into tiny particles. These particles will be suspended in the drying tower and mix with the air to form a dust cloud. When the dust concentration reaches the explosion limit, it may cause a dust explosion if it encounters an ignition source such as an electric spark.

[0031] Therefore, an explosion-proof electric vibrator is used. The base of the electric vibrator is fixed to the bottom of the pipe body 1 by a bracket. The bracket effectively transmits the vibration energy of the electric vibrator to the pipe body 1, thereby cleaning the inside and outside of the pipe body 1 and preventing material accumulation.

[0032] Furthermore, the composite structure consists of a bimetallic layer and a thermal insulation layer. The inner layer is a metal layer, the middle layer is a thermal insulation layer, and the outer layer is a metal layer. The inner layer is a 310S steel layer or an Incoloy 800H alloy, the interlayer is a ceramic fiber thermal insulation layer or an aerogel thermal insulation layer, and the outer layer is a 304 steel layer. The temperature resistance is improved, thereby preventing thermal deformation of the material and ensuring the long-term stable operation of the structure.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-temperature resistant spray drying tower internal air outlet duct structure to prevent material accumulation on the outer wall, characterized in that, The system includes a pipe body, the top of which is symmetrically provided with a ramp, the inclination angle of which is 35-45°. A vibration device is provided outside the pipe body to vibrate the pipe body. The pipe body has metal layers inside and out, and a heat insulation layer in the middle.

2. The high-temperature resistant spray drying tower internal air outlet duct structure for preventing material accumulation on the outer wall as described in claim 1, characterized in that, The slope combination has an inverted V-shaped structure.

3. The high-temperature resistant spray drying tower internal air outlet duct structure for preventing material accumulation on the outer wall as described in claim 1, characterized in that, The slope surface is covered with an anti-adhesion polytetrafluoroethylene coating.

4. The high-temperature resistant spray drying tower internal air outlet duct structure for preventing material accumulation on the outer wall as described in claim 1, characterized in that, The vibration device is a silicon carbide air hammer or a high-temperature resistant electric vibrator.

5. The high-temperature resistant spray drying tower internal air outlet duct structure for preventing material accumulation on the outer wall as described in claim 4, characterized in that, The silicon carbide air hammer includes a base, which is welded to the outer wall of one side of the pipe body.

6. The high-temperature resistant spray drying tower internal air outlet duct structure for preventing material accumulation on the outer wall as described in claim 4, characterized in that, The electric vibrator includes a base, which is fixed to one side of the pipe body by a fixing bracket.

7. The high-temperature resistant spray drying tower internal air outlet duct structure for preventing material accumulation on the outer wall as described in claim 1, characterized in that, The pipe body consists of a bimetallic layer and an insulation layer. The inner layer is a metal layer, the middle layer is an insulation layer, and the outer layer is a metal layer. The inner layer is a 310S steel layer or an Incoloy 800H alloy, the interlayer is a ceramic fiber insulation layer or an aerogel insulation layer, and the outer layer is a 304 steel layer.

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